Summary statistics for a_c6_14 variable in snf_rollup2540_96_2006 dataset : Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- a_c6_14 | 2 -8074064 1.11e+07 -1.59e+07 -206353 by Jean Roth , jroth@nber.org , 17 Feb 2018